Telescopic straw Benefits of brushless motors

Advantages of brushless motors:

(1) No brush, low interference

The brushless motor removes the brush, and the most direct change is that there is no electric spark generated when the brush motor is running, which greatly reduces the interference of the electric spark on the remote control radio equipment.

(2) Low noise and smooth operation

The brushless motor has no brush, the friction is greatly reduced during operation, the operation is smooth, and the noise is much lower. This advantage is a huge support for the stability of the model.

(3) Long life and low maintenance cost

Without the brush, the wear of the brushless motor is mainly on the bearing. From the mechanical point of view, the brushless motor is almost a maintenance-free motor. When necessary, only need to do some dust removal maintenance. Comparing the previous and the next, we know the advantages of brushless motors over brushed motors, but everything is not absolute. The performance characteristics of brushless motors such as excellent low-speed torque performance and large torque are irreplaceable. However, In terms of the ease of use of brushless motors, with the decline in the cost of brushless controllers and the development and market competition of brushless technologies at home and abroad, brushless power systems are in the stage of rapid development and popularization, which has also greatly promoted The development of the model movement.

Disadvantages of brushed motors:

(1) Large friction and large loss

Old model friends have encountered this problem when playing with brushed motors before. After using the motor for a period of time, the motor needs to be turned on to clean the motor's carbon brush, which is time-consuming and laborious, and the maintenance intensity is no less than a home cleaning.

(2) High heat generation and short life span

Due to the structure of the brushed motor, the contact resistance between the brush and the commutator is very large, which causes the overall resistance of the motor to be large and easy to generate heat. The permanent magnet is a thermal element. If the temperature is too high, the magnet will demagnetize , The performance of the motor is reduced, and the service life of the brushed motor is affected.

(3) Low efficiency and low output power

The heating problem of the brushed motor mentioned above is largely due to the fact that the current is done on the internal resistance of the motor, so the electrical energy is largely converted into heat energy, so the output power of the brushed motor is not high and the efficiency is not high.

Other differences of brushless motors:

(1) Scope of application:

Brushless motor: usually used in equipment with relatively high control requirements and relatively high speed, such as aircraft models, precision instruments, etc., which have strict control of motor speed and high speed.

Carbon brush motor: usually power equipment uses brush motors, such as hair dryers, factory motors, household range hoods, etc. In addition, the speed of the series motor can reach very high, but due to the wear of the carbon brushes, use Life is not as good as brushless motors.

(2) Service life:

Brushless motor: Usually the service life is in the order of tens of thousands of hours, but the service life of brushless motors is also very different due to different bearings.

Carbon brush motor: Usually, the continuous working life of a brush motor is hundreds to more than 1,000 hours. When the use limit is reached, the carbon brush needs to be replaced, otherwise it is easy to cause bearing wear.

(3) Use effect:

Brushless motor: usually digital frequency conversion control, strong controllability, from a few revolutions per minute to tens of thousands of revolutions per minute can be easily achieved.

Carbon brush motor: The old carbon brush motor generally works at a constant speed after starting, and the speed adjustment is not very easy. The series motor can also reach 20,000 rpm, but the service life will be relatively short.

(4) Energy saving:

Relatively speaking, brushless motors controlled by inverter technology will save much energy than series motors. The most typical ones are inverter air conditioners and refrigerators.

(5) Future maintenance:

The carbon brush motor needs to be replaced. If it is not replaced in time, the motor will be damaged. The brushless motor has a long service life, usually more than 10 times that of the brush motor. However, if it is broken, the motor needs to be replaced, but the daily maintenance is basic No need.

(6) The noise aspect has nothing to do with whether it is a brushed motor, but mainly depends on the matching of the bearing and the internal components of the motor.

(7) The parameter index of the model brushless motor, in addition to the dimensions (outer diameter, length, shaft diameter, etc.), weight, voltage range, no-load current, maximum current and other parameters, there is also an important index KV value, this value It is a unique performance parameter of the brushless motor and an important data for judging the performance characteristics of the brushless motor.